In the early 1940s, Penn medical student Christian Lambertsen designed the LARU respirator as a self-contained breathing device for covert underwater missions.
https://tinyurl.com/ps34kfbd Business InsiderIn the early 1940s, Penn medical student Christian Lambertsen designed the LARU respirator as a self-contained breathing device for covert underwater missions.
https://tinyurl.com/ps34kfbd Business Insider